Belt polishing-frame



(No Hodel.)

J. LONGDEN. BELT POLISHING FRAME.

Patented De 8, 189

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UNITED STATES PATENT OFFICE.

JOHNLONGDEN, OF BAY STATE, MASSACHUSETS.

BELT POLlSHlNG-FRAM E.

SPECIFICATION forming part of Letters Patent No. 572,812, dated December8, 1896.

Application filed May 2, 1896. Serial No. 589,973. (No model.)

To all whom, it may concern.-

Be it known that 1, JOHN LONGDEN, a citizen of the United States ofAmerica, residing at Bay State, in the county of Hampshire and State ofMassachusetts, have invented new and useful Improvements in BeltPolishing- Frames, of which the followingis a specification.

This invention relates to metal-polishing mechanism, and particularly tobeltingframes, so called, and has for its object the construction of amachine for polishing both sides of an article at the same time, whethersaid two sides are parallel or are in different planes; and theinvention consists in the arrangem ent and construction hereinafterfully described and claimed.

In the drawings forming part of this specification, Figure l is a sideelevation, partly in section, of a machine constructed accordingto myinvention. Fig. 2 is a plan view of the same. Fig. 3 is asection takenon line 3 3, Fig. 2. Fig. 4 is a section on line 44., Fig. 1. Fig. 5 isaperspective view of a clamp for holding a piece to be operated upon bythe machine. Fig. 6 is an enlarged view of the two adjustablebelt-shafts in section,

showing them adapted to the polishing of a table-knife blade.

Referring to the drawings, A, A, B, and B represent perpendicular frameportions of a polishing-machine, and O a horizontal frame portion boltedto B and B. On frames AA are two driving-shafts 2 and 3, supported forrotation in horizontally-adjustable bearingboxes 4 4 and 5 5. Each ofsaid shafts 2 and 3 is provided with tight and loose pulleys 6 7 and S9, respectively, and said shafts'2 and 3 are offset and located oneabove the other, to the end that the belt-pulleys 10 and 12, located onthe inner ends of each of said shafts 2 and 3, shall lie in the samevertical plane. Suitable driving-belts 13 and 14 engage said tight andloose pulleys on the said driving-shafts 2 and 3. Said frames B Bareprovided with perpendicular openings D near the forward edges thereoffor the reception of two bearing-boxes 15 15 and 16 16 for each of saidshafts, which are movable vertically within said openings. Near thecontiguous ends of the said boxes in openings D are located two shafts17 and 18, which, as

' shown in Fig. 2, extend transverselythrough said boxes and between theframes B and B. Two po1ishing-belts E E are appliedto said pulleys 10and 12 and said shafts 17 and 18, as shown. Said bearing-boxes 16 arerestrained against lateral movement in the said openings D in the framesB B by plates 19 20, bolted onto the inside and outside faces of thesaid frames. The upper ends of said plates, where they lie opposite thesaid boxes 15, do not fit as closely the sides of said boxes as they doagainst the sides of box 16, thereby permitting to said boxes 15 and theshaft 17 therein a little play between the opposite faces of theopenings D, whereby the surface of said polishing-beltE on said shaft 17may adapt itself to the tapered surface of a piece of work, like theblade of a knife, for instance. The said box 16 is adjusted verticallywithin said opening D by the screw'2l, which engages with asuitably-threaded hole in the lower end of said box, and whose head hasa bearing on the bottom of said opening.

Pressure at the will of the operator may be applied to the boxes 15, inwhich shaft 17 runs, by turning down the screw 22 on the top of theframes B B, between the inner .end of which and the top of said box thespring 23 is located and which is compressed by the turning in of saidscrew through said frame.

A work-carryin g table 24 is located on frame 0. Said table is shown inperspective in Fig. 5, a clamping device for holding a table-knife beingshown thereon in an open position. Said table is supported in twoslideways 25 for reciprocating motion toward and from the shafts 17 and18, which is imparted thereto by the crank-wheel 26, revolved by thebelt 27, runnin g over a suitable pulley on the crank-shaft 27, and aconnecting-rod 28 from said crankwheel to said work-holding table.

The clamping device above mentioned consists of supports 29, suitablyformed for holding a table-knife by the handle thereof, and a hingedpart 30, suitably formed to correspond to the supports 29 for holdingsaid handle. One of these articles having been placed on said supports29 the part 30 is swung over to a horizontal position, inclosing saidhandle, and the locking-lever 31, hinged to said table, is moved to aperpendicular position, the projection 32 thereon fitting closely overthe upper edge of said'part 30, as seen in Fig. 3,'and securely holdingthe knife therein. The height of said clamping device above the table 24is such that the blade of a knife clamped therein will lie in positionto be inserted between the belts E E as they pass over the shafts 1'718. Said crank-wheel 26 is provided with a slot 33 therein, throughwhich passes the threaded end of-a stud 34, having a shoulder 35 turnedthereon for bearing against the surface of the crank-wheel. (See Fig.4E.) Anut on the opposite surface of said crank-wheel serves to securesaid stud at any convenient point within said slot. The degree ofmovement of the sliding work-holding table is controlled by the placingof the said stud in said slot at any desired place therein. Fig. 6 showsthe position of a knife-blade at the limit of forward movement thereofbetween said belts. VVhen said machines are used for finishingknife-blades, the diameters of the two shafts 17 and 18 are made smallenough so that the curve of the belts around said shafts will besubstantially the same as the curve forming the neck of the blade, andthe said neck portion finished whenthe blade is finished instead of bytwo separate operations.

In operating this machine on table-knives, for instance, a knife isclamped by its handle in the clamping device on the sliding. table 24:,and the stud in the crank-wheel loosened and set at such a distance fromthe center of the crankshaft as will give a movement to said slidingtable equal to the length of the knife-blade to be finished. Said studis then secured in the crank-Wheel and'the belts are then shipped ontothe tight pulleys of the shafts 2 and 3 and the belts E E caused torevolve rapidly, the belt on the crank-shaft meanwhile imparting rotarymotion to the crank-wheel, whereby said Work-holding table carrying theknife clamped thereon is given a reciprocating motion to and from thesaid belts E E, and said knife-blade is passed in and out therebetweenuntil it is properly finished. Said knife-blade being tapered in twodirections, from neck to point and from the back to the cutting edgethereof, it is seen that by the construction of the within-describedmechanism, that is, one fixed shaft and one shaft which can adjustitself to a surface lying in a plane not parallel with the plane of thework in contact with the fixed shaft, means are provided hereinfor'polishing much more cheaply and rapidly. many articles which nowhave to be handled several times before they are completed. Furthermore,one man can run several of these machines, or as many as he can start upwhile a knife-blade is being finished on the first one started.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. A belt polishingrframeconsisting of' two polishing-belts one of saidbelts running on two rigidly-held axes, and the other of said beltsrunning on onefixed and one movable axis, said movable axis and one ofsaid fixed axes being in close proximity to each other, a work-holdingtable and means for securing a piece of work thereon, and means forimpartinga-reciprocating movement to said table, toward and from thesaid two axes lying in proximity to each other, substantially asdescribed.

2. In a belt polishing-frame two oppositelyrunning belts, each providedwith a drivingshaft and a driven arbor which are respectively adjustablein horizontal and vertical directions, said arbors running in closeproximity to one another, combined with a workholding table which has areoiprocatory movement toward and from said last-named arbors, andwork-clamping devices on said table, and a connecting-rod engaging withone end of said table and with a slotted crank whereby the degree ofmovement given to said table may be varied, combined with means forrotating said belts and said slotted crank, substantially as described.

JOHN LONGDEN.

Vitnesses H. A. CHAPIN, ALBERT LONGDEN.

